If I'm right-clicking to open in a new tab, then it's usually because I want to open multiple links on a page while scrolling through it. So I want those loaded up in the background, and I want to remain on the original page until I've finished reading the material there.
Yes, you CAN do these things in Vivaldi... by using three-finger keyboard shortcuts, scrolling further down in a context menu, or using a wonky middle mouse button that most non-Solaris users never use.
I'm a bit perplexed by the response, though. This is Hacker News. We nod in approval as people reject text editors over the most obscure and trivial of UX preferences. We anticipate that when a blog link is posted, half of the discussion will revolve around its font kerning rather than its content. Etc.
So here you have a web browser, the application that most of us spend the overwhelming majority of our computer-time using. It's primary marketing pitch is extensive support for customization. It has some UX quirks that are out of step with the other major browsers, and it's baffled that anyone might want to customize that.
Hey, implement the suggestion or not, that's their call. But dismissing a customization out-of-hand as "incorrect" sure does cut against its own marketing. I think that's a bigger deal than my 15 pixels. It's an indication that the real goal is creating the perfect successor for Opera 12 die-hards. Which is awesome for that tiny group of individuals, but I don't think it's going to lead to any serious traction beyond them.